The dynamic and sometimes diffuse nature of membership make gang boundaries sometimes difficult to discern for law enforcement officials or researchers, and even for members themselves. The current study draws on social network analysis of co-offending data to assess its utility in identifying the “core” membership of a youth gang active in a rural region...

It is now widely understood that extremists use the Internet in attempts to accomplish many of their objectives. In this chapter we present a web-crawler called the Terrorism and Extremism Network Extractor (TENE), designed to gather information about extremist activities on the Internet. In particular, this chapter will focus on how TENE may help differentiate...